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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715f9e93553a1a632001914f6c2edc2c1f64eb71c4e22da17bca7a0c87ddbadb' 
  AND token = 'cudM9FrMYqbxm3eqhSmlhwnjtsoIRQ+WSoEaAIQnbbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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