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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e3b5576d0abf22ca2947d136f67c1c7b1af289bdc737b74f96b20f2cdcfc785' 
  AND token = 'Z+hm7GjSy3PPpaA+3aX33Gx0gn/p0MuVCeDTLDFBN7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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