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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c7734076b73d97e3ff7cbaa773387e379cd25b1fa685b74d43b4e207e3fa7b' 
  AND token = 'cJGth7u6uEcmcMoWJHlMo3Ws3r7kYM6fIkdOhuTHJV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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