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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db98877149b7d4d399c82efae74d934d628d6634a47aeb6e5efc0f615521b22b' 
  AND token = 'T2lOB6I6AXlhs8c2XIF3n1M4TcL1xlXr10G/wkneXJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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