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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179fb9297df7f278f0e2ba82cef5664319500f6d3e694b730ac6473a440abd58' 
  AND token = 'Qbh0ZsJYkYl17granBehLTA15mLqXmyunUyS25u4d74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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