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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8114e578ee73cc8730c47f3e37d9ccee13a794f327a954c8258acea9c9cc6d57' 
  AND token = '5LjHEcHaCK3adY6LPdUT5WN1zPqFeRoAfHb9G5RloRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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