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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5edd26a7c0518d9fe6494b577631ed24e242482438e4fd6050c754ba311057' 
  AND token = 'ZAUsqwWbg/cQKl8uanDMYX6F3DI+OO5D/7aHg36cnCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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