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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00210a165edaf5c3c1d8e58bffb2b1400e8083ccf895ccde48564915f5e8d0ff' 
  AND token = 'wHvhXyu8y48jZEqkzMFysr60jHchTq8G39Y4hX8lEI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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