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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719f8ff990ffcdd02d99c9ca828afa98e4c490470361c94216164891f5fb61f7' 
  AND token = 'lEHf4Yh5B2SHClMORBYtAfwGwLR42j/EpPdSYKK39ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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