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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71d87702c72e99997cc7889be9fe80f7402fe115ca8d769ec4a52c14e0355da' 
  AND token = 'kCRcRk8pib7I3Vip5ImpuSqMQ0Mhji/9QmuLO12TyNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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