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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8075b6d05ff006c5d9f92a8d6deae00dc965395d15576ddf6e6d9563402a5b5b' 
  AND token = 'dFsyuNQpdP9pJcXktVnPyCpyFxow6gc987UhMYAyJ44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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