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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc72f114a7185aa16e17b0d9b11d98785306435762153adf440b64d6ba392055' 
  AND token = '+xtwoQGzE6YEr2mwiV0kzWSGO6bDQRXg4ymmm3BBb80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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