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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c3315427fe8ce29ff7571466b5fe805a43c4695c75a2eaf3ee2dc6c5211f16' 
  AND token = 'o25ru0ujCr7ihtksGCCvgU/JD/nl/6sYePVY61GCgUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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