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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec479965fbfe66057f6791f8f5bf4f7a6db910d8f72206622bbb971cc156c72f' 
  AND token = 'oBZzMcS07sxnoh50s+MM+C5XJRSIe6U4NuktQha28Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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