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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ce567047115515e87ca85579d59000fb45b86f086b0fe8bcf2d9249b799beb' 
  AND token = '/3WSbjjTzBB6AwqMMHfIZss2gMvwpj3af7NN6QF6dl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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