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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a14ca031a82f050a1557a8171a83234b4ccb18a2aacf35bb782dfd8563ee4d' 
  AND token = '7g+0fMkYqHDnSEqcngaeT710vua4HotJkWb3zAlWOr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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