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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5c91aee6001ec2ec6eda393859f6f77517892fffda6c5381fdc199939a7e0c' 
  AND token = '/6Hl5b+qgMkZ8byR2X104HF4DHyNOF2Le2nBZRD7Lo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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