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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e91484d16c4690e6f2f5da1e7a4ee4cd713da346412add5ab508a2c3c8ea47d' 
  AND token = 'obD7wyyfvf2v7O76hm4YeS/NEhZnR10c4Tjvd8CUgTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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