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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd928ea148cdcf5aee47c2753bb4ba0b1ceae8aa4c9e5e026cb64bba883302c' 
  AND token = 'iry/bBh4QGFfwNTh+oSrskCW0xM8kVZqDeJtc/lMKjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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