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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c3bc90948850c0a99deb47284967a41eebd21bd0f1a65ffa2331cf09150909' 
  AND token = 'Xxqv6vYFSZ1ZDk0IWfOQRN2S2HveJ4WoLoI7+Pc1NGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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