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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7409fb1f972af20b3b37f71ad9af44febcd6e31a1b3eb46ab672ae1559c5a8e5' 
  AND token = 'MPIyOJ85AM40xV9AvSTGZcfhezslCdG6s8/Hs6GoNYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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