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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3294de373c91acedbedeafdff437d1706f21606dee18115ceafcad2ba30ca134' 
  AND token = '7Wx0SU1iwnBKOpBvvvSTEUy2TGQ+Lxp/oFHLPjK2npU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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