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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3e091b7d7df41b50e548635ce1eb4883f1ccf70db6345e5a456857bf183b0d2' 
  AND token = 'GdvHEgKUJSDnqJ4tCUHfn9iDaC7fQbe+dV+2APY7bTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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