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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac37e1088a1dfad9fccb5f4180f77b9091e97d56f8e0841db727007d701cff70' 
  AND token = 'IfhDaDShjhA4CzuAVmpckPy+U6VA5gqmvy7Hfu8eP2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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