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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef35bad87742477a0e3ec4ead829616aa2b34a31c8d3abf33ee1e9aafc6fa985' 
  AND token = '5QPbZFcB+BVMu+oI6jp+/8wMdM24JyZg/74CUdI9y98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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