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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c337ed57c5b11dcfe52fec91a9b5251c47a9a0e51bd9e385f0cc4f7d966b0089' 
  AND token = 'aYsms6ubIc6ROxLScjIZ8lCoZn18TOM0+VugAbnMuZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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