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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68337d3dbc2f562a0823c8b2ef755aabfc5a25baf8d27100860d6d3dfbae26d4' 
  AND token = '5yNwYkJ+F4BeYMMsVhrLfD5xQTHTfwdBTO9l06p3gmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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