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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea1de74e00f0b56abcb8191ce961e30d7e25241268815f095e765b330f763e2' 
  AND token = 'yOF0RDtWxVUzNXTuMQztiBSQDLp6F1kRD/EWPbkEBhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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