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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b51f5a701d98a3c6ff0475f0b96f1d870a035c540cce6f1e468bf7ee0e0e10e' 
  AND token = 'WaWo6jwYJEBGhqVtjf6chIKXLmG/sNUjJQo8ZeIjrA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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