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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3b2bee2ac9f1d74c3a25bf04bbf7d048c0f73c0fc296f31b36daadeb1d4b56' 
  AND token = 'ZrLH+X9D5FwJL4fZqiN8caiCEedYRS3X7j3pfPV+Zr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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