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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a28c86641c9442c220c8fdf39310f2c31d59430b271101604f5c5278abcc80' 
  AND token = 'xf4z7dwa7Mfo4z+VgRtTkCIFWVIi47PKFWD7ISt1HKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}