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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33d8f176e4d8ed87270798ec56a2adc9594c86ddd9cd7badfce227945a4416d' 
  AND token = 'cW8OHyk2kotW95j1/m0Xg49FEcn9tD5R/bdRe5dDhfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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