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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f933655da13c94171a59a04a718e4bc9f8cc0c8f4a9bb1b40a447cd08ac98dc5' 
  AND token = 'WOI8Z0WQkan/gpDz8ZGtJVTFLrEd0y8eKWpQ6ZC3pW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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