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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5795d5f2113cd6f6dc66d8381f341d611af41471520c70005903efcb311a921' 
  AND token = '+uVo9wGKD6asurWMM82bqAwPMnMcOj0v1Yw3QBmpMik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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