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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd37a739c948dc1296ce2e43b9910368fa30ae0786f4ed04fcf259ee7abbf00' 
  AND token = 'yQuQSyUNnvT1WA0X+2XVqffNCN/BjtQkQkV13ylOPso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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