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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b8f81fdc54a19ab17f47f7d56e8cd466c31fba93b48af8366f52372746f6b6' 
  AND token = 's1H2qx4Z+RgF+RGnXubgodWSLliRI3g2XG8snqSkeSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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