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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61254fd4c1903be5cae90182a503b0b776e64b02b6b9afd905405288cb915c9e' 
  AND token = 'e3dTdvEdIh/0sgRHoz/B3G3fZ2X67TCLPG0xoZq0by0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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