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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d5ecddb5fac48e5aac37c73af3fa3f30137da841f4ca2b388ea9b6ac88cb81' 
  AND token = 'KOZI4kW/G8+24qZcPIS4GOddrHciEFcUR+Vni4zzSNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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