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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e919110050ff7a2b5e7f0e2ec556cdb177b162d47a7af80e1e1c0cc0de3ed8' 
  AND token = 'ahoKeljL5+iuXJuaq4lqDYrw/mlKz56oEuk5kt5q2QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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