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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b588b74c8ce424696b8d6b0d72ea6167f17cdd90bc9fb45b46ebebc347dfc51d' 
  AND token = 'mFG4/+ohFmQHsQsAGcdsxmarhsqiNWZE7TlojtIe+QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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