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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06149750741ab835be9a3454c9a793963780a4209510ead60c75fba5fbbdd109' 
  AND token = 'dFA2zztz1/P2gAUJO9/cAImEKiBtmLK4kQSDs3yEyN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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