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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceab5caca4343f19883575f16fed03d351eb85c5b9cb230629935201bf512f14' 
  AND token = 'zZA3GeipAkc/h2NfHc3Tr2s9BR4K/dQ126sl6iHxAkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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