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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeb68990e6e7057caf4c5a72c45850a61189f8dc1aed65e74c84338b6d245be' 
  AND token = 'TA/BVggzocchgvrrJg0CoscCv5vdgx6L5v9M45ZWZa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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