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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1027e7e006ed95ec8a94828f0c681874a5a93b957a959145b2861a62ec77bf10' 
  AND token = 'lihOpodsh6cTSok7H0cCHwL78yY7+LXn8aEASGfl3Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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