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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9e7d0e099eb816e9c847d485e2b5830691644b5e62593b47c0a56274e95d44' 
  AND token = '05pKaK+oPjSfaLLfKglEj1QYMPt7rGVFeCUn8AuiJdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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