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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631ccac42549954d3a99cd3192c2b11ce225bc22be08a9229ff49b9b306a769a' 
  AND token = 'aZSwMguJOiaI6UUOfjQ/OMimDvzGap6NBBRIaaNnQU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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