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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ee782022a6ea06314035a0129e04c5b4a0be2eff78a290ff512d83e922675a' 
  AND token = 'EcWqdW7jZuTG2D4uzXjyyckxQdQRRv2Kb+YrzfhDrqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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