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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba86293b1bd83942430293f60014232326d2a25fa4d8a4ab624f8c86ae0e72e2' 
  AND token = 'PfFkvfhASLZlsNoHqm5qsqo6KbEm/ymOwt/UbqvQQFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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