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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd037309baad63606da3870e12acdd4a96408690833e5ddda29d92a147d0f7082' 
  AND token = 'UdSmKjybQT+XHTLgetEFPHmaraIPMtrE5h1zjcKLPaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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