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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54dc10e2dfdce436fb855e1a1b0f210d1dd09ba64b804fd654a8a51a5d8c9fe' 
  AND token = 'xDb2mKiwt/bI4VVcs69Gcfo0Gs87PI33WALCOfa8IOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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