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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b452a5edfc76e24a0b2f0b95dc68ed1d0a3a6b130bcb23b7aa7d3c6fad0f97' 
  AND token = 'RhYK9EVDf+An8XC3Mr+OiyDadgJLYdIu1ibqT1Tocq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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